中文摘要：

随着实际应用的发展，核电站、飞行器发动机、气体燃料等领域均提出了进行大数量点数氢气监测的要求，但目前已有的光纤氢气传感系统仅能实现单点测量。为解决上述问题，将波分复用技术和光纤氢气传感技术相结合，设计了一种可实现多点测量的波分复用光纤氢气传感系统，阐述了该系统的基本原理、光路结构和技术优势，并从理论上分析了进行多点氢气监测的可行性。根据理论分析的结果，基于已有器材搭建了一套4通道的波分复用光纤氢气传感系统，同时设计了一套实验装置并利用该装置对传感系统进行了验证实验。通过对光纤链路各节点传输光光谱和传感头反射信号光功率的测试，验证了所提出的新型氢气传感系统不仅可以实现多点测量，而且各测点具有较好的独立性和性能，l小时内测量稳定性优于±1％，测量范围达到了0-4％，基本误差优于±2％。理论分析和实验结果对于研究大数量点数氢气测量技术及系统极具参考意义。

英文摘要：

As the investigation deepened, it is necessary to detect the hydrogen concentration with large quantities of points, in the field of nuclear power station, aerocraft engine, gaseous fuel, et al, but the existing optical fiber hydrogen sensing systems are able to measure only one point at a time. A Wavelength Division Multiplexed （WDM） optical fiber hydrogen sensing system was proposed for the detection of multi-point hydrogen. The topology, principle and advantage of WDM optical fiber hydrogen sensing system were expatiated, and the technical feasibility of the novel system was introduced in detail. According to the analysis, a WDM optical fiber hydrogen sensing system was assembled with four measuring channels using the components well developed in the telecommunication industry, and an additional scheme was also developed for the hydrogen experiment. The results show that the novel optical fiber hydrogen sensing system is able to measure multi-point hydrogen simultaneously, and different measuring channels do not interfere with one another by measuring spectral evolvement and power of the optical signal. The performance test shows that good stability （less than ±1% in an hour） and small error （less than ±2%） are achieved within the measuring range from 0 to 4%. The research results will provide a valuable reference for the optical fiber hydrogen sensing system to measure the hydrogen concentration with large quantities of points.